Ore-crushing machine.



No. 745,710. PATENTED DEC. 1, 1903,

' H. YARNELL.

ORE GRUSHING MACHINE.

- APPLIGATIDN'FILBD MAR. 21, 1902.

' n0 MODEL.

' R e J.

: To all whom it may concern:

- complish these objects by the mechanism de- G, which form treads on which the crushing- Fig. 2 is a plan view of the crushing-rollers In the operation of my machine the ore is the driving wheel rests upon the periphery .of the crushing-rolls and is held in frictional HARRISON YARNELL, OF PASADENA, CALIFQRNIA'.

oee-ca'eseinc t n/roams.

SPEGIFICATION forming part of Letters Patent No. 745,710, dated December 1, 1903,

Application iilcd March 21, 1902.

Be it known that I, HARRISON YARnELn-a, citizen of the United States, residing'at Pasa: deiia, in the county of Los Angeles and State of California, have invented new and useful Improvements in Ore-Crushing Machines, of which the following is a specification.

My invention relates to that class of orecrushers in which the oreis crushed by means ofrollers traveling over a tread, and the 'ob-' jects thereof is to provide a crushing-machine of that class that will be easilyopcrated and will have great crushing efficiency. '1 'acscribed herein and illustrated in the accompanying drawings, forming a part hereof, in which- 1 Figure l is a side elevation of my machine.

and mortar. Fig. 3 is a vertical section,

' In the drawings, A is the weight-holding receptacle, which may be filled with rocks or other heavy material to givethe rollers the necessary crushing power. It is attached to the upper surface of the driving-wheel B,

which is 'revolubly mounted on the stationary vertical shaft O,affixed in the mortar D. Driving-wheel B is provided on its lower surface with annular steel rings E, which provide a re movable bearing-surface that rests on the'pereplaced when worn too much. In the bottom of the mortar are placed removable steel rings rolls travel. The crushing-rolls are provided j with removable steel tires that can be removed and replaced when worn too much.

They are revolubl y mounted on axles ll,which are afiixed to huh I, which is revolubly mounted on the central shaft 0. In the upper portionof the mortar are the usual screens J which permit the pulverized ore to escape therefrom when reduced to the desired finene'ss.

fed into the mortar withjthe required amount of water through ch ut'eK. Motion is imparted to the driving-wheel.byrope L, or a belt may be used thereon instead of the rope. As

contact therewith by the weight on the upper serial No. 99,362. (No model.)

surface thereof,- it will be seen that the rolls are rotated with less power than if the power were applied to the axles of the crushing-rolls, as is the' usual manner of applying power in ore-crushing machines of this class. It will also be observed that I have mounted the crushing-rolls in series of three to each tread, so that as they move thereon one set of rolls will cause the ore that it does not crush on high and low speed mill in one structure.

The ore is kept from splashing out of the mortar by a canvas curtain N, affixedto the bottom of the driving-wheel. If desired, only one set of two orgnore rollsmay be used.- I prefer three to the set, as it enables'any one of the rolls to pass over a lump of ore much easier than if fouror more rolls were used,

It will'also be observed that the drivingavheel rests upon and is supported by the crushing rolls and is provided with'a steel bearing-surface which provides means whereby any ore which clings to the periphery of the cruslu ing-rolls will be crushed betweot-ithe bearingsurface of the driving-wheel and the roll, thereby crushing .ore at both-the top and bot tom of the crushing-rolls at the same'time. V Having described my invention, what I claim as new, and desire to .secure'by Letters "Patent, is V r 1. An ore cnushing machine comprislng'a mortar having tapering sides provided with screens; a circular tread in'the bottom of said mortar adjacent tothe inner side; a circular tread in the bottom of said mortar adjacent to the outer side; an amalgamating trough be? tween said treads two sets of revolving crushing-rolls adapted to trayel on said treads, tho

set-onone tread traveling intermediate the set on the other treaQ-wherebyone set-of erushing-rollsjpushes uncrushed ore intothe path of the otherset of crush ngerolls; means too to drive said rolls comprising 2t Weighted drivi trends for said rolls, an :unnlgmnztting-trough ing-Wheel revolubly mounted therein having interlnediz-l-te said treads, and means to imrelnovztble treads resting upon and supported part motion to said rolls. by said rolls and adapted on the revolution In Witness that I claim the foregoing I have 5 thereof to impart motion to said rolls by conhereunto subscribed my name this 15th day :5

tact with the periphery thereof. of March, 1902.

2. In anore-crushing' machine two setsof HARRISON YARXELL. revolving circular traveling crushing-rolls, \Vitnesses: traveling on trends of different diameter, one G. E. HARPHAM, IO set traveling intermediate the other set, M. O. NICKELESON. 

